https://en.wikipedia.org/wiki/World_War_I_casualties#Casualties_in_the_borders_of_1914%E2%80%9318 https://en.wikipedia.org/wiki/World_War_I_casualties#Casualt..

https://en.wikipedia.org/wiki/World_War_I_casualties#Casualties_in_the_borders_of_1914%E2%80%9318 https://en.wikipedia.org/wiki/World_War_I_casualties#Casualt... was interesting, sorting by 'Deaths as % of population'. About 5% of the total population of the central powers was killed, compared to a bit more than 1% of the allied powers. About 2-3% of the total US population died during the American Civil War.